2686638 has 16 divisors (see below), whose sum is σ = 5656320. Its totient is φ = 848376.

The previous prime is 2686631. The next prime is 2686667. The reversal of 2686638 is 8366862.

It is a junction number, because it is equal to n+sod(n) for n = 2686596 and 2686605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11670 + ... + 11897.

It is an arithmetic number, because the mean of its divisors is an integer number (353520).

2^2686638 is an apocalyptic number.

2686638 is an abundant number, since it is smaller than the sum of its proper divisors (2969682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2686638 is a wasteful number, since it uses less digits than its factorization.

2686638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23591.

The product of its digits is 82944, while the sum is 39.

The square root of 2686638 is about 1639.0967024553. The cubic root of 2686638 is about 139.0175779575.

The spelling of 2686638 in words is "two million, six hundred eighty-six thousand, six hundred thirty-eight".